Can I charge as a photographer in washington st without having certification?

I am a stay at home mom with my first newborn. I'm not looking to go back to a crappy job, and took photography/photoshop classes in highschool (yes i aced them), and own a professional cam. I want to become a photographer but dont want to be doing anything illegal, i need the money so is it okay for me to charge for my services?
Thanks for the help everyone!

cert has no meaning other than ego for the photographer. AFTER you are earning 1k a mo
from this activity --on the 4th month, I would go get a biz license.

till then happy shooting. started out my pro career as a photographer and still shoot monthly.

a biz license is an ordinance so that is the MOST you will be violating..............can guide further if you wish